Browsing by Subject "InP"

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    Environmental friendly InP/ZnS nanocrystals
    (2012) Coşkun, Yasemin
    Semiconductor nanocrystals are nanometer scale fluorescent crystallites with tunable optical properties, which can be controlled by the material composition and particle size. They can be prepared using various synthesis techniques and find applications in many different areas ranging from life sciences to electronics. In this thesis, indium phosphide based nanocrystals are studied for LED applications. The thesis research work focuses on the colloidal synthesis method and material characterization of these nanocrystals. Using one pot synthesis method, the indium phosphide/zinc sulfide (InP/ZnS) core/shell nanocrystal structures are synthesized. This synthesis technique allows for a reproducible and tunable preparation method. The material characterization techniques used in this thesis include UV-Vis spectroscopy, photoluminescence spectroscopy, transmission electron microscopy (TEM), X-ray diffraction, X-ray photoelectron spectroscopy (XPS), inductively coupled plasma-mass spectrometry (ICP-MS), and Zeta Sizer (or DLS). These properties make InP/ZnS nanocrystals comparable to their cadmium (Cd) containing counterparts with respect to their optical properties, and InP/ZnS nanocrystals offer the potential to replace them because of environmental concerns in LED applications.
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    High-quality InP/ZnS nanocrystals with high photometric performance and their application to white quantum dot light-emitting diodes
    (IEEE, 2012) Yang, X.; Tan, S. T.; Demir, Hilmi Volkan; Sun, X. W.
    Full visible range covering InP/ZnS core-shell nanocrystals with high photometric performance have been prepared. Making use of these nanocrystals, we demonstrate a white quantum dot LED with a high color rendering index of 91. © 2012 IEEE.
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    Sulfide-capped ınp/zns quantum dot nanoassemblies for a photoactive antibacterial surface
    (American Chemical Society, 2024-03-05) Khan, Saad Ullah; Surme, Saliha; Eren, Guncem Ozgun; Almammadov, Toghrul; Pehlivan, Cigdem; Kaya, Lokman; Hassnain, Muhammad; Onal, Asim; Balamur, Ridvan; Sahin, Afsun; Vanalakar, Sharadrao; Kolemen, Safacan; Alkan, Fahri; Kavakli, Ibrahim Halil; Nizamoglu, Sedat
    Semiconductor photocatalysis has recently emerged as a promising method for microbial inactivation. So far, quantum dots have generally been investigated as antibacterial suspension. Instead, here we demonstrate a InP/ZnS quantum dot nanoassembly film against both Gram-negative and Gram-positive bacteria. For effective operation in the solid phase, a thin layer of ZnS shell was grown on InP QD and the native long-chain ligand of stearic acid was replaced with sulfide that led to a high quantum yield of superoxide generation as 4.9%. QDs are assembled onto solid surfaces through sequential dip coating of positively charged poly(diallyldimethylammonium chloride) and negatively charged QDs. These QD nanoassemblies demonstrate growth inhibition against Escherichia coli and multidrug-resistant Staphylococcus aureus under illumination. Interestingly, such an approach can be directly applied to irregular surfaces, as well. This study unveils the potential of the nanoengineering of QDs for antibacterial coatings.